Alarm mainframe



FIG. 1 is a front view of an embodiment of our new design.

FIG. 2 is a rear view of our new design shown in FIG. 1.

FIG. 3 is a left-side view of our new design shown in FIG. 1.

FIG. 4 is a right-side view of our new design shown in FIG. 1.

FIG. 5 is a top view of our new design shown in FIG. 1; and,

FIG. 6 is a perspective view of our new design shown in FIG. 1. 

CLAIM The ornamental design for an alarm mainframe, as shown and described. 